[IAUC] IAUC 9171: COMET 103P/HARTLEY; C/2009 U10-U12; 245P; NOTICE TO SUBSCRIBERS [25139-2011/04-R1]
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Circular No. 9171
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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CBATIAU en EPS.HARVARD.EDU ISSN 0081-0304
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Prepared using the Tamkin Foundation Computer Network
COMET 103P/HARTLEY
N. Dello Russo and R. J. Vervack, Jr., Applied Physics
Laboratory, Johns Hopkins University; and H. Kawakita and H.
Kobayashi, Kyoto Sangyo University, report the detection at
infrared wavelengths of the parent volatile molecules H_2O, CH_3OH,
C_2H_6, and HCN in comet 103P on Sept. 16.3-16.5 UT using NIRSPEC
at the W. M. Keck Observatory. C_2H_2 was tentatively detected,
and CH_4 was searched for but not detected. For an aperture of
0".42 x 1".74 centered on the nucleus, the authors obtained a water
rotational temperature of 57 +/- 7 K, based on twenty-one detected
H_2O emissions. Production rates or upper limits (x 10^25
molecules/s) for Sept. 16 are: H_2O, 410 +/- 40; CH_3OH, 4.3 +/-
0.4; C_2H_6, 2.0 +/- 0.2; CH_4, < 2.0 (3-sigma); HCN, 1.5 +/- 0.2;
C_2H_2, 0.7 +/- 0.1. Preliminary production-rate ratios are then
H_2O:CH_3OH:C_2H_6:CH_4:HCN:C_2H_2 = 100:1.0:0.5:(<0.5):0.4:0.2.
Compared to other comets, production-rate ratios in 103P on this
date are within the normal range for CH_3OH, C_2H_6, and C_2H_2
-- while CH_4 and HCN are slightly depleted and enhanced,
respectively.
COMETS C/2009 U10-U12 (SOHO)
Further to IAUC 9170, additional near-sun comets have been
found on SOHO website images -- presumed Kreutz sungrazers except
for C/2009 U10 (Marsden group), which was marginally diffuse (peak
mag about 7.5). K. Battams notes that C/2009 U11 was slightly
diffuse with a "slight" tail, and C/2009 U12 was very diffuse with
a "large" tail (mag about 5).
Comet 2009 UT R.A.(2000)Decl. Inst. F MPEC
C/2009 U10 Oct. 22.321 13 44.8 -12 54 C3/2 BZ 2010-L45
C/2009 U11 22.696 13 39.3 -12 31 C3/2 BZ 2010-L45
C/2009 U12 25.113 13 28.3 -15 12 C3/2 MK 2010-L45
COMET 245P/WISE
Comet P/2010 L1 = P/2002 Q16 (cf. IAUCs 9151, 9166) has been
given the permanent designation 245P.
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2010 September 30 (9171) Daniel W. E. Green
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